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Square is a parallelogram with right angles and equal sides (Fig.35). A square is a particular case of a rectangle and a rhombus simultaneously; so, it has all their above mentioned properties. Trapezoid is a quadrangle, two opposite sides of which are parallel (Fig.36).
A parallelogram is a four-sided shape with opposite sides that are parallel. Because of the parallel lines, the opposites sides are equal in length. There are some unique properties of the angles inside parallelograms. First, the opposite angles are equal. Also, the adjacent angles are supplementary, which means they add up to 180 degrees. The perimeter of the parallelogram below, where the sides are 4, 4, 5 and 5, is 18. Example of a parallelogram When we have a specific type of quadrilateral like the one below, we can determine its area.